9 Changes In National Silk Standards By New Standards

Changes in the new standards

The national standard GB/T24252-2009 "silk quilt" changes in comparison with the industry standard mainly in the following aspects:

(1) the national standard added quotes GB/T17529-2006 in the normative quotation text, "determination of prohibited azo dyes in textiles" and GB/T18401-2003 "basic safety technical specification for national textiles products", and specified the safety technical indexes of silk quilts.

(2) the standard adds terms and definitions, and defines and interprets eight terms related to the product from a scientific and professional point of view.

(3) in the appendix, two standard appendixes are added to the determination of filler fiber content and chemical determination of mulberry / tussah silk mixture.

(4) in terms of product grade classification, the products in the original industry standard are classified into specialty products, first grade products and grade two products.

This classification is unified with the classification of other textiles, so that the new standard is more standardized and systematized.

(5) in terms of safety technology, considering that the filler of silk quilt is mainly protein fiber, it is a weak acid substance. Therefore, in the specific technical index, the pH value of the filler is 4.0~8.0, and its upper limit is lower than that of other textile products (GB18401 - 2003 stipulates that the pH value of the C product is 4.0~9.0), which is in line with the characteristics of the silk fiber.

(6) the quality deviation of the national standard fillers is 2.5% higher than that of the two grade products in the industry standard (the industry standard is -5.0~+10.0, and the current national standard is -2.5~+10.0).

The requirements for products are stricter and the interests of consumers are guaranteed.

(7) the compression rate of compression and resilience in technical specifications of the national standard products is lower than that of the original industry standard: superior products are more than 45%, first class products are more than 40% (original industry standard grade products are more than 55%, grade one is more than 45%), and the recovery rates of GB requirements are all higher than those of the original industry standard, that is, superior products are more than 95%, first grade products are more than 90% (original industry standard grade products are more than 80%, grade a products are more than 70%).

The adjustment of these two technical indicators is more in line with the characteristics of silk fiber and the actual use of silk quilts.

(8) in addition to the explicit definition of silk products in the text, the national standard also provides quantitative assessment indicators for the quality and quality of the stuffed articles. For example, silk must be filled with mulberry silk and (or) tussah silk more than 50%; the silk content of the top quality and first grade products must be 100%; the content of the silks of qualified products should reach more than 50%.

At the same time, the quality index of the filling is also refined. The new standard has relaxed the length of the silk of top quality and first grade products. It is changed from the original standard of the trade standard to the top grade product, the first grade product must be pure filament to the top grade product, the first grade must be long silk or medium length silk, and the qualified product does not specify the length of the silk.

This reduces the restriction on raw materials, expands the range of use of raw materials, and increases the variety and grade of products.

(9) the appearance quality requirements and process quality requirements of the products in the national standard also increase a lot of contents than the industry standards, such as: four corners, edges must be positive, the quality difference of the corners is not greater than 20%, and the four sides are solid.

At the same time, the uniformity of filler is also stipulated in quantity, that is, the difference rate of superior products is less than 10%, the difference rate of first grade products is less than 20%, and the difference rate of qualified products is less than 25%.

Two, lack of standards

This standard takes into account the common interests of production enterprises and consumers, and gives more detailed and clear explanations and regulations on product quality, reducing product quality disputes that may arise in the process of product sales. However, there are still some deficiencies in the quality supervision and inspection department, some of which are less maneuverable, and can not be accurately grasped and judged in specific tests.

(1) the standard stipulates that silk can be filled with long silk floss, medium silk and short silk floss, or a mixture of silk and cotton. For example, the filler content of the product is 50% tussah silk (long silk silk) and 50% mulberry silk (medium length silk).

(2) the standard gives three kinds of raw materials, including long silk floss, medium silk floss and short silk floss.

If it is a mixture of silk floss, long, medium and short silk can not be distinguished.

(3) the standard requires that the type of silk should be identified in the filler, but there is not an accurate standard and method to detect it.

In the normative appendix B, the national standard specifies the chemical determination method of mulberry / tussah silk mixed filling, and also indicates that under certain circumstances, mulberry silk can not be fully dissolved.

But experiments show that under general conditions, mulberry silk and tussah silk can not be distinguished from each other at all.

Therefore, we need to study this aspect and find a practical way.